In a serious breach of security, three youngsters drove upto one of the inner gates of Prime Minister Manmohan Singh's residence in New Delhi on Thursday night.

A boy and two girls, one of them driving a black luxury car, drove up to the alighting point at the Prime Minister's 7, Race Course Residence, after passing through security cordon at the main gate.

Surprised Special Protection Group personnel stopped the vehicle at the alighting point from where ministers and visitors are escorted into a ferry vehicle inside and asked the youngsters, all in their twenties, who they were.